京 都 大 学 防 災 研 究 所 年 報 第 50 号 B 平 成 19 年 4 月
Annuals of Disas. Prev. Res. Inst., Kyoto Univ., No. 50 B, 2007Ἣጊ᷹ࠟࠬⷰ߆ࠄߺߚญ᳗⦟ㇱፉߩᵴേ⁁ᴫ㧖㧖ᐔᨋ㗅৻ ࡮㊁਄ஜᴦ ࡮ᄢፉᒄశ㧖㧖࡮੗ญᱜੱ
㧖᧲੩ᎿᬺᄢቇἫጊᵹ૕⎇ⓥ࠮ࡦ࠲࡯
㧖㧖ർᶏ㆏ᄢቇᄢቇ㒮ℂቇ⎇ⓥ⑼

ⷐ ᣦญ᳗⦟ㇱፉἫጊߦߪᣂጪ߅ࠃ߮ฎጪἫญߦྃ᳇ᵴേ߇ሽ࿷ߔࠆ‫ޕ‬2003 ᐕ㗃߆ࠄᣂጪἫ    ญᐩ߅ࠃ߮๟ㄝߩྃ᳇ᵴേ߇ᵴ⊒ൻߒߪߓ߼㧘Ἣጊࠟࠬߦߪ㧘ࡑࠣࡑ↱᧪ߩ㜞᷷ߩἫጊࠟࠬߦ․㐳⊛ߥੑ㉄ൻࠗࠝ࠙㧘᳓⚛㧘৻㉄ൻ὇⚛߇฽߹ࠇࠆࠃ߁ߦߥߞߚ‫ߚ߹ޕ‬㧘᷷ᐲߩㅪ⛯᷹ⷰߢߪ㧘2006 ᐕ 8 ᦬㗃߆ࠄ࿾㔡ᵴേ߿࿾Ზᄌേߦኻᔕߒߚྃ᳇᷷ᐲߩ਄᣹߇᷹ⷰߐࠇߡ޿ࠆ‫ࠄࠇߎޕ‬Ἣጊࠟࠬߩൻቇ⚵ᚑ߿᷷ᐲᄌൻߪ㧘หἫጊߩᵴേ߇ᵴ⊒ൻߒߚߎߣࠍ␜ߒߡ޿ࠆ‫ޕ‬ᴾࠠ࡯ࡢ࡯࠼ ญ᳗⦟ㇱፉἫጊ㧘Ἣጊࠟࠬ㧘Ἣጊᵴേᐲ ߪߓ߼ߦ Ἣጊࠟࠬߩൻቇ⚵ᚑᴾᴾญ᳗⦟ㇱፉߢߪ㧘1999 ᐕએ㒠࿾㔡ߩ⟲⊒߇ᤨ‫ⷰޘ‬Table 1 ߦἫญ๟ㄝߢណขߒߚἫጊࠟࠬߩ᷷ᐲ߅ࠃ᷹ߐࠇ㧘ߘߩᵴേ߇ᵴ⊒ൻߒߡ޿ࠆ‫ޕ‬หἫጊߦߪ㧘߮ൻቇ⚵ᚑࠍ␜ߒߚ‫ޕ‬ห⴫ߪ㧘ྃ᳇᷷ᐲ㧘ࠟࠬ⚵ᚑᣂጪἫญ๟ㄝ߅ࠃ߮ฎጪἫญߦྃἫᵴേ߇⷗ࠄࠇࠆ߆ࠄ⸘▚ߒߚ⷗߆ߌߩᐔⴧ᷷ᐲ㧔AET㧕㧘᳓⫳᳇ߩỚ߇㧘ߎࠇ߹ߢߪ 1945 ᐕ߅ࠃ߮ 1980 ᐕߦྃἫߒߚᣂᐲ㧘᳓ࠍ㒰޿ߚࠟࠬ⚵ᚑߩ⊖ಽ₸㧘ࠕ࡞ࠞ࡝ṁᶧߦጪἫญ᧲஥ߩഀࠇ⋡Ἣญධ┵ߩྃ᳇ᵴേ߇ᵴ⊒ߢ㧘ๆ෼ߐࠇߥ޿ࠟࠬ⚵ᚑ㧔R-gas㧕ߩ⊖ಽ₸ࠍ㗅ߦ␜ߒ᷹ⷰࠍ㐿ᆎߒߚ 1992 ᐕߩྃ᳇᷷ᐲߪ㜞ߊ㧘ࡂࡠࠥࡦߚ‫ߚ߹ޕ‬㧘ห⴫ߦߪ 1980 ᐕྃἫ⋥ᓟߦᣂጪ᧲ߩഀࠇൻ᳓⚛߿ੑ㉄ൻ⎫㤛߇ᄙߊ฽߹ࠇߡ޿ߚ‫ߒ߆ߒޕ‬㧘⋡ἫญߢណขߒߚἫጊࠟࠬ⚵ᚑ߅ࠃ߮ฎጪἫญߢណ

2003 ᐕ㗃߆ࠄߪᣂጪἫญᐩߦྃ᳇ᵴേ߇⹺߼ࠄࠇࠃขߒߚἫጊࠟࠬ⚵ᚑ߽૬ߖߡ␜ߒߚ‫ޕ‬߁ߦߥࠅ㧘Ἣญධߩྃ᳇ᵴേ߽ᵴ⊒ൻߒߪߓ߼ߚ‫ޕ‬ᣂጪἫญ๟ㄝߢྃ᳇ᵴേ߇ᦨ߽ᵴ⊒ߢ޽ߞߚ᧲஥߹ߚ㧘2005 ᐕߦ౉ࠆߣห࿾ၞߩྃ᳇ᵴേߪ৻Ბߣᵴഀࠇ⋡Ἣญධ┵㧔એᓟ㧘Ἣญ᧲㧕ߩ 1992 ᐕߩἫጊࠟ⊒ൻߒ㧘หᤨߦ㧘Ἣญ⷏ߩྃ᳇ᵴേ߽ᵴ⊒ൻߒߪߓࠬߪ㧘᷷ᐲ߇ 340͠ߣ㜞᷷ߢ㧘Ἣጊࠟࠬਛߩ HF㧘HCl㧘߼㧘Ἣጊࠟࠬߩൻቇ⚵ᚑߦᄢ߈ߥᄌൻ߇᷹ⷰߐࠇࠆ

SO2 㧘H2 Ớᐲ߇⪺ߒߊ㜞ߊ㧘㜞᷷ߩࡑࠣࡑ↱᧪ߩ⚵ࠃ߁ߦߥߞߚ‫⿒ޕ‬ᄖ✢ᾲ᷹ⷰߢ߽㧘2003 ᐕએ㒠ᣂጪᚑߢ޽ߞߚ‫ߒ߆ߒޕ‬㧘1998 ᐕߩหྃ᳇᷷ᐲߪ⚂ 150͠๟ㄝߩ࿾ᾲ࡮ྃ᳇࿾Ꮺߩ᜛ᄢ߇᷹ⷰߐࠇߡ޿ࠆ㧔੗

ߣ 200͠ૐਅߒߚ‫ޕ‬2000 ᐕߦߪߐࠄߦ᷷ᐲૐਅߒ㧘ญ, 2007㧕‫ߚ߹ޕ‬㧘ో⏛ജߩㅪ⛯᷹ⷰߢߪ㧘2003 ᐕ߆100͠ߣߥߞߚ‫ྃޕ‬᳇᷷ᐲߩૐਅߣߣ߽ߦ㧘HCl㧘SO2㧘ࠄᣂጪἫญ⋥ਅߢ⫾ᾲࠍ␜ߔᄌൻ߇ߪߓ߹ߞߚ㧔␹

H2 Ớᐲ߽ૐߊߥߞߚ㧔Fig.1㧕‫ߚ߹ޕ‬㧘2003 ᐕߦߪ⪺↰㧘2007㧕‫ޕ‬ߒߊྃ᳇ᵴേ߇ᒙߊߥࠅ㧘2004 ᐕߦߪἫጊࠟࠬߩណἫጊࠟࠬߩ⚵ᚑᄌൻߣߣ߽ߦߘߩ᷷ᐲ߽Ἣጊᵴേข߇࿎㔍ߣߥߞߚ‫ޕ‬ߩᛠីߦ㊀ⷐߥ᷹ⷰ㗄⋡ߢ޽ࠅ㧘2005 ᐕ߆ࠄᣂጪἫ1998 ᐕߦἫญ᧲ߢណขߒߚἫጊࠟࠬಝ❗᳓ߩ㉄ญߩ⷏㧘ධ㧘᧲ߩྃ᳇࿾Ꮺߦ߅޿ߡ᷷ᐲߩㅪ⛯᷹ⷰ⚛࡮᳓⚛ห૏૕Ყߪ㧘į18O ߇+1.0 ‰㧘įD ߇ 㧙 23 ‰ࠍ㐿ᆎߒ㧘Ἣጊࠟࠬൻቇ⚵ᚑ߅ࠃ߮ߘߩᄌൻߣ૬ߖ㧘㨪 㧙 25 ‰ߢ޽ࠅ㧘Ἣጊࠟࠬਛߩ᳓ߪห࿾ၞߩᄤ᳓ߣหἫጊߩᦨㄭߩἫጊᵴേᐲߦߟ޿ߡᬌ⸛ߒߚ‫ޕ‬ࡑࠣࡑ↱᧪ߩ᳓߇⚂ 1㧦1 ߢᷙวߒߚ߽ߩߢ޽ߞߚ‫ޕ‬－ 359 －

Table 1 Chemical composition of fumaloric gas from Kuchinoerabujima volcanoᐕ 5 ᦬ߩ⺞ᩏᤨߦᗵߓࠄࠇߥ߆ߞߚ SO2 ⥇߇ᒝߊᗵHCl㪇㪅㪇㪇䃂䇭Ἣญ᧲
䂾䇭Ἣญධ
䃁䇭ฎጪ

ߓࠄࠇߚ‫ޕ‬ᣂጪ๟ㄝߩࠟࠬߦ SO2 ߇฽߹ࠇࠆࠃ߁ߦ㪈㪅㪇ߥߞߚߎߣߪ㧘2006 ᐕ 12 ᦬ߩ SO2 ᡼಴㊂߇⚂ 40㪇㪅㪏㪇㪅㪉㪌

ton/day ߢ޽ߞߚ㧔᫪㧘2007㧕ߎߣߣ߽⺞๺⊛ߢ޽ࠆ‫ޕ‬Ἣญධ߅ࠃ߮⷏ߩྃ᳇᷷ᐲߪ޿ߕࠇ߽ 100͠೨ᓟ㪇㪅㪍㪇㪅㪌㪇

ߣૐ޿߇㧘ਔྃ᳇ࠟࠬਛߦߪ CO ࠟࠬ߇฽߹ࠇߡ߅㪇㪅㪋ࠅ㧘SO2 㧘H2 ࠟࠬ߇㜞Ớᐲߢ฽߹ࠇߡ޿ࠆߎߣߣ૬㪇㪅㪎㪌㪇㪅㪉䃂䃂

1992

2000

㪈㪅㪇㪇

Total S 㪇㪅㪇㪇䃂 䃁㪇㪅㪉㪌ߖࠇ߫㧘⃻࿷ᣂጪἫญ๟ㄝߦྃ಴ߒߡ޿ࠆἫጊࠟࠬ1998䃂㪇㪅㪌㪇㪇㪅㪎㪌߇㜞᷷ߩࡑࠣࡑ↱᧪ߢ޽ࠆߎߣࠍ␜ߒߡ޿ࠆ‫ޕ‬2003

䃂 㪇㪅㪇㪈㪅㪇㪇 CO2Fig. 2 ߦἫጊᵴേߩᜰᮡߣߒߡ↪޿ࠄࠇࠆ SO2/H2S

Fig.1 Diagram of HCl㧙 Total S㧙 CO2 of fumaloricࡕ࡞Ყߩᄌൻࠍ␜ߒߚ‫ޕ‬Ἣญ᧲ߩഀࠇ⋡Ἣญධ┵㧔એ

gas from Kuchinoerabujima volcanoᓟἫญ᧲㧕ߩἫጊࠟࠬߩ SO2/H2S ߪ 1992 ᐕߦߪ⚂ 2ߢ޽ߞߚ߇㧘ߘߩᓟߪᓢ‫ߦޘ‬ዊߐߥࠅ 2003 ᐕߩ୯ߪ0.1 એਅߢ޽ࠆ‫৻ޕ‬ᣇ㧘2003 ᐕ߆ࠄྃ᳇ᵴേ߇ᵴ⊒2003 ᐕߩἫጊࠟࠬಝ❗᳓ߩห૏૕Ყߪ㧘ߘࠇߙࠇ 㧙ൻߒߚἫญධߩἫጊࠟࠬߩ SO2/H2S Ყߪ㧘⚂ 7 ߣᄢ

6.6 ‰㧘㧙 54 ‰ߢ㧘⚂ 100͠ߩ᳓߇᳇ᶧಽ㔌ߒߚ⫳᳇߈ߥ୯ߢ㧘એᓟᓢ‫ߦޘ‬ᄢ߈ߊߥߞߚ‫ߚ߹ޕ‬㧘2005 ᐕ⋧ߩ୯ߦㄭ޿‫ޕ‬ߦྃ᳇ᵴേߩᵴ⊒ൻ߇⹺߼ࠄࠇἫญ⷏ߩἫጊ߽ࠟࠬ

৻ᣇ㧘2003 ᐕߦᵴേ߇ᵴ⊒ൻߒߚἫญධߩྃ᳇ࠟࠬ ߩ ᷷ ᐲ ߪ 100͠ ೨ ᓟ ߣ ૐ ޿ ߽ ߩ ߩ Ἣ ጊ ࠟࠬਛߩ᷷ᐲߪૐ޿߽ߩߩ㧘SO2/H2S Ყߪ⚂ 20 ߣᄢ߈ߥ୯ߢ޽ߞߚ‫ޕ‬ዏ㧘1980 ᐕߩྃἫ⋥ᓟߦἫญ᧲஥ߩഀࠇ⋡Ἣญߢ

SO2 㧘H2 Ớᐲߪ㜞ߊ㧘ߐࠄߦྃ᳇ᵴേ߇ᵴ⊒ൻߒߚ
2005 ᐕએ㒠ߪ㧘ἫጊࠟࠬਛߩߎࠇࠄᚑಽỚᐲ߇⪺ߒណขߒߚἫጊࠟࠬߩ⎫㤛ᚑಽߪ㧘SO2 ߦንߺ㧘H2Sߊ㜞ߊߥߞߚ‫ޕ‬2005 ᐕߩἫญ⷏ߢណขߒߚྃ᳇ࠟࠬ߇ᭂ߼ߡዋߥߊ㧘ਔ⠪ߩᲧߪ⚂ 200 ߣ⪺ߒߊᄢ߈ߊ㧘ߦ߽ SO2 ߇㜞Ớᐲߢ฽߹ࠇߡ޿ߚ‫ߚ߹ޕ‬㧘Ἣጊࠟࠬ

2003 ᐕએ㒠ߩᣂጪἫญධ߅ࠃ߮⷏ߩ୯ߩ⚂ 10 ୚ߢߩណข࡮ಽᨆߪⴕߞߡ޿ߥ޿߇㧘ᣂጪἫญߩධ⷏ㇱ޽ࠆ‫ߩߎޕ‬㆑޿ߪ㧘⃻࿷㧘ࡑࠣࡑ߆ࠄߩ㜞᷷ߩἫጊߩᒙ޿ྃ᳇ࠟࠬߪ㧘2006 ᐕ 9 ᦬ߩ⺞ᩏᤨߦߪ㧘2005ࠟࠬߪ࿾ਅ᳓ߣធ⸅ߒߡ߅ࠅ㧘SO2 ߩ৻ㇱ߇᳓ߦṁ－ 360 －ൻߒߚᣂጪἫญධߣἫญ⷏ߩྃ᳇᷷ࠟࠬᐲߪ޿ߕࠇ
߽⚂ 100͠ߣૐ޿߽ߩߩ㧘AET ߪ 450͠㨪550͠ߣ㜞
30

ߊ㧘2003 ᐕએ㒠࿾ਅߩ᷷ᐲ߇㜞ߊߥߞߡ޿ࠆߎߣࠍ25␜ߒߡ޿ࠆ‫ߚ߹ޕ‬㧘AET ߣྃ᳇᷷ᐲߣߦߪ⚂ 400͠Ἣญ⷏ߩࠡࡖ࠶ࡊ߇޽ࠆ߇㧘ߎࠇߪࡑࠣࡑ߆ࠄߩ㜞᷷ߩἫ
20ጊࠟࠬ߇࿾ਅ᳓㧔ᶏ᳓㧕ߣធ⸅ߦࠃߞߡ㧘ྃ᳇᷷ᐲߪૐਅߒߚ߽ߩߩࠟࠬᚑಽ⋧੕ߩ෻ᔕߪᕆ಄଻ᜬߐ

15

Ἣญධ

ࠇߡ޿ࠆߎߣࠍ␜ߒߡ޿ࠆ‫ߚ߹ޕ‬㧘Ἣญධߩ AET ߪ

102003 ᐕએ㒠ᓢ‫ߦޘ‬਄᣹ߔࠆ௑ะߦ޽ࠆ‫ߩߎޕ‬࿾ਅ᷷ᐲߩ਄᣹ߪ㧘2003 ᐕએ㒠ᣂጪ⋥ਅߢᾲᶖ⏛߇ㅴⴕߒ

5Ἣญ᧲ߡ޿ࠆߎߣࠍ␜ߔో⏛ജᄌൻ㧔␹↰㧘2007㧕ߣኻᔕ

01990

1995

2000

ߒߚ⚿ᨐߢ޽ࠆ‫ޕ‬

2005ߎࠇࠄᦨㄭߩᣂጪἫญ๟ㄝߩྃ᳇ᵴേߩᵴ⊒ൻ߿

Fig.2 The SO2/H2S mol. ratio in fumarolic gas fromἫጊࠟࠬߩൻቇ⚵ᚑ㧘ផቯߐࠇߚ࿾ਅ᷷ᐲߥߤߪ㧘

Kuchinoerabujima volcanoญ᳗⦟ㇱፉἫጊߩἫጊᵴേᵄߪ᣿ࠄ߆ߦᵴ⊒ൻߒߡ޿ࠆߎߣࠍ␜ໂߒߡ޿ࠆ‫ޕ‬
⸃⒖ⴕߒߡ޿ࠆߚ߼ߣ⠨߃ࠄࠇࠆ‫ߚ߹ޕ‬㧘⃻࿷ጊ㗂๟ㄝߦྃ಴ߒߡ޿ࠆἫጊࠟࠬਛߦߪ HCl ߇฽߹ࠇߡ100޿ߥ޿‫ߪࠇߎޕ‬㧘HCl ߇ SO2 ߦᲧߴߡ᳓ߦኻߔࠆṁ90⸃ᐲ߇⚂ 1 ᩴᄢ߈޿ߚ߼㧘ߘߩ߶ߣࠎߤ߇࿾ਅ᳓ߦ

80ṁߌߚߚ߼ߣ⠨߃ࠄࠇ㧘HCl Ớᐲ߆ࠄ߽Ἣጊࠟࠬ߇70࿾⴫ߦ೔㆐ߔࠆᵹ〝ߢ᳓ߣߩធ⸅ߒߡ޿ࠆߎߣࠍ␜

60

ߒߡ޿ࠆ‫ޕ‬50ἫญධἫญ᧲

40

ዏ㧘2000 ᐕߦ⺞ᩏߒߚฎጪἫญౝߩἫጊࠟࠬߩ᷷

30

ᐲߪ 113͠ߢ㧘Ἣญ᧲ߩ᷷ᐲࠃࠅ⚂ 10͠㜞ߊ㧘Ἣጊ

20ࠟࠬߦߪ HCl㧘SO2 ߇㜞Ớᐲߢ฽߹ࠇߡ޿ࠆ‫ߚ߹ޕ‬㧘

10

SO2/H2S Ყߪ⚂ 2 ߢ޽ࠅ㧘H2 Ớᐲ߇ૐ޿ߎߣࠍ㒰ߌ

0

Ἣญ⷏

1990

߫㧘หᤨᦼߩἫญ᧲ߩࠟࠬߣૃߚ⚵ᚑߢ޽ࠆ‫ޕ‬

1995

2000

2005

Fig.3 The variation of H2 concentration in fumarolic߹ߚ㧘ἫጊᵴേߩᄌൻࠍផቯߔࠆἫጊࠟࠬᚑಽߣ

gas from Kuchinoerabujima volcanoߒߡ H2 Ớᐲ߽↪޿ࠄࠇࠆ‫ޕ‬Fig. 3 ߦ R ࠟࠬߩ H2 Ớᐲߩᤨ㑆ᄌൻࠍ␜ߒߚ‫ޕ‬Ἣญ᧲ߩἫጊࠟࠬਛߩ H2 Ớᐲ
600

ߪ 1992 ᐕએ㒠㧘᷷ᐲ㧘SO2/H2S Ყߣห᭽ߦᓢ‫ߦޘ‬ૐߊߥߞߡ޿ࠆ‫৻ޕ‬ᣇ㧘Ἣญධߩࠟࠬਛߩ H2 Ớᐲߪ㧘Ἣญධ㪘㪜㪫

500

2003 ᐕએ㒠ᓢ‫ߦޘ‬㜞ߊߥࠆ௑ะߢᄌൻߒ㧘2005 ᐕ߅400

Ἣญ⷏㪘㪜㪫ࠃ߮ 2006 ᐕߩ R ࠟࠬਛߩ H2 Ớᐲߪ㧘70㨪80%ߣᭂ߼ߡ㜞޿‫ޕ‬Ἣญ᧲㪘㪜㪫300

200 ⷗߆ߌߩᐔⴧ᷷ᐲἫญ⷏ྃ᳇᷷ᐲἫญ᧲ྃ᳇᷷ᐲ100Ἣญධྃ᳇᷷ᐲἫጊࠟࠬߩൻቇ⚵ᚑ߆ࠄ㧘⷗߆ߌߩᐔⴧ᷷ᐲ

01992

㧔AET㧕ࠍ⸘▚ߒ㧘࿾ਅߩᾲ⊛⁁ᘒߩᄌൻࠍផቯߔ

1994

1996

1998

2000

2002

2004

2006

2008

Fig.4 The outlet temperature and apparent equilibriumࠆߎߣ߇ߢ߈ࠆ‫ߪߢߎߎޕ‬㧘SO2 + 3H2 = H2S + 2H2O

temperature of fumarolic gasߩ෻ᔕ߆ࠄ᳞߼ߚ AET ࠍྃ᳇᷷ᐲߣ૬ߖߡ Fig.4 ߦ␜ߒߚ‫ޕ‬೨ㅀߒߚࠃ߁ߦ 1992 ᐕߩἫญ᧲ߩྃ᳇᷷ࠟࠬᐲߪ㧘340͠ߢ޽ࠅ㧘ߘߩ AET ߪ⚂ 400͠ߣ㜞߆ߞߚ߇㧘㧠㧚ྃ᳇᷷ࠟࠬᐲߩㅪ⛯᷹ⷰߘߩᓟߪᓢ‫ߦޘ‬ૐਅߒ㧘2003 ᐕߩ AET ߪ⚂ 300͠ߢ

ᴾ޽ߞߚ‫ޕ‬2003 ᐕ߅ࠃ߮ 2005 ᐕ߆ࠄྃ᳇ᵴേ߇ᵴ⊒－ 361 －Ἣጊᵴേߩᵴ⊒ൻߪ㧘Ἣጊࠟࠬ⚵ᚑ߿᷷ᐲᄌൻࠍ߽ߚࠄߔߎߣߪ㧘ߎࠇ߹ߢߦ߽ᄙߊߩἫጊߢ᷹ⷰߐࠇߡ޿ࠆ㧔଀߃߫㧘ᐔᨋ࡮ᣣਅㇱ㧘1985㧘ᐔᨋ㧘1986㧕‫ ޕ‬

2/14/1

6/1

8/1

10/1 12/1

2/1

㩷4/1

6/1

8/1

10/1 12/1

2/1

4/1

㪉㪇

102

2005 ᐕ߆ࠄᣂጪᣂጪἫญ๟ㄝߩ᧲㧘ධ㧘⷏ߩ 3 ྃ䃂Ἣญ᧲䂥Ἣญධ
䂓Ἣญ⷏

101᳇࿾Ꮺߩྃ᳇᷷ᐲߩㅪ⛯᷹ⷰࠍ㐿ᆎߒߚ‫ߚ޿↪ޕ‬᷷

㪈㪏
㪈㪍

100

ᐲ࠮ࡦࠨ࡯ߪ⊕㊄ᛶ᛫૕㧔Ἣญධ㧘⷏㧕߅ࠃ߮ K ᾲ

㪈㪋
99

㩷
Temperatureવኻ㧔Ἣญ᧲㧕ߢ㧘᷹ቯ๟ᦼߪ 1 ᤨ㑆ߢ޽ࠆ‫ⷰޕ‬᷹࠺࡯࠲ߪࠝ࡯ࡉࠦࡓㅢାⴡᤊࠍ↪޿ߡ㧘ࠗࡦ࠲࡯ࡀ
࠶࠻⚻↱ߢขᓧߔࠆ‫ޕ‬

㪈㪉
㪈㪇

98

㪏

97

㪍

Fig. 5 ߦ㧘3 ᷹ⷰὐߩᣣᦨ㜞᷷ᐲߣᣣ೎࿾㔡࿁ᢙࠍ

96૬ߖߡ␜ߒߚ‫ޕ‬Ἣญධ᷹ⷰὐߩྃ᳇᷷ᐲߪ㧘᷹ⷰ㐿

95㪋ᆎ⋥ᓟߪ㧘97.5͠ߢ޽ߞߚ߇㧘2005 ᐕ 10 ᦬㗃߆ࠄૐ

㪉
㪇

94
2/1

ਅߒ㧘2006 ᐕ 2 ᦬㨪7 ᦬ߦߪ 92͠߹ߢਅ߇ߞߚ߇㧘

4/1

6/1

8/1

10/1 12/1

2005

2/1

2006

4/1

6/1

8/1

㩷

10/1 12/1

2/1

4/1

2007

หᐕ 8 ᦬߆ࠄᕆỗߥ᷷ᐲ਄᣹ߦォߓ㧘9 ᦬ߦߪ 98͠

Fig.5 The variation of fumarolic temperature which߹ߢ਄᣹ߒߚ‫ߚ߹ޕ‬㧘10 ᦬ߪߓ߼ߦ⧯ᐓߩ᷷ᐲૐਅ

was observed around the summit and the daily߇᷹ⷰߐࠇߚ߇㧘10 ᦬ਅᣨߦ⚂ 0.5͠ߩᕆỗߥ᷷ᐲ

frequency of earthquake਄᣹߇᷹ⷰߐࠇ㧘12 ᦬ᧃߦߪ 98.9͠ߩᣣᦨ㜞᷷ᐲ߇᷹ⷰߐࠇߚ‫ޕ‬หᤨᦼߦߪ㧘GPS ᷹ⷰߢ߽㧘ᕆỗߥጊ૕⤘ᒛ߇᷹ⷰߐࠇߡ޿ࠆ㧔ᢪ⮮࡮੗ญ㧘2007㧕‫ߚ߹ޕ‬㧘 ญ᳗⦟ㇱፉἫጊߢߪ㧘ᣂጪἫญ๟ㄝߩྃ᳇ᵴേ߇

2007 ᐕ 2 ᦬ೋᣨߦ߽ᕆỗߥ᷷ᐲ਄᣹߇᷹ⷰߐࠇ㧘2003 ᐕએ㒠ᵴ⊒ߣߥߞߚ‫ྃࠄࠇߎޕ‬᳇ࠟࠬߩൻቇ⚵100͠ࠍ⿥߃ࠆᣣᦨ㜞᷷ᐲ߇᷹ⷰߐࠇߚ‫ޕ‬ዏ㧘⍴ᦼ⊛ᚑߪ㧘ࡑࠣࡑ↱᧪ߩ㜞᷷ߩἫጊࠟࠬଏ⛎㊂߇Ⴧടߒߥ᷷ᐲߩᕆỗߥᄌേߪ㒠᳓╬ߩᓇ㗀ߢ޽ࠆ‫ޕ‬ߡ޿ࠆߎߣࠍ෻ᤋߒߚᄌൻߢ㧘หἫጊߩᵴേᐲ߇㜞Ἣญ⷏᷹ⷰὐߩ᷷ᐲߪ 2005 ᐕ 10 ᦬㗃߆ࠄ᷷ᐲૐ߹ߞߡ޿ࠆߎߣࠍ␜ߒߡ޿ࠆ‫ߚ߹ޕ‬㧘ྃ᳇᷷ᐲߪ㧘ਅߒߪߓ߼㧘2006 ᐕ 2 ᦬㨪7 ᦬ߦߪ᷹ⷰ㐿ᆎᤨߦᲧ࿾㔡ᵴേ߿ጊ㗂ၞߩ࿾Ზᄌേߣㅪേߒߡ਄᣹ߒ㧘ࡑߴߡ⚂ 1͠ૐਅߒߚ‫ߒ߆ߒޕ‬㧘Ἣญධ᷹ⷰὐߣห᭽ࠣࡑ߆ࠄߩἫጊࠟࠬଏ⛎㊂ߩჇട߇ᢿ⛯⊛ߦ⿠ߎߞߦ 8 ᦬߆ࠄ਄᣹௑ะߦᄌࠊࠅ㧘⃻࿷ߪ᷹ⷰ㐿ᆎᤨߣߡ޿ࠆߎߣࠍ␜ߒߡ޿ࠆ‫ޕ‬หߓ᷷ᐲߦᓳߒߡ޿ࠆ‫ޕ‬ਔ᷹ⷰὐߩ᷷ᐲ਄᣹߇ᆎ߹ߎࠇࠄߩἫጊ᷹ࠟࠬⷰߩ⚿ᨐߣ㧘੗ญࠄ㧔2002㧕

ߞߚ 2006 ᐕ 8 ᦬߆ࠄߪ㧘࿾㔡࿁ᢙ߽Ⴧടߒߡ޿ࠆ‫ޕ‬ߦࠃߞߡឭ໒ߐࠇߡ޿ࠆ࿾㔡ᵴേ߿㧘߿߿ᷓ޿႐ᚲ․ߦ㧘8 ᦬ߦߪ࿾ਅߩᾲ᳓♽ߢ⿠ߎࠆߣ⠨߃ࠄࠇࠆߦ⿠࿃ߔࠆ࿾Ზᄌേߥߤߦၮߠ޿ߚ࿾ਅ᭴ㅧ㧔␹↰ࡕࡁࠢࡠࡑ ࠹ ࠖࠢߥ࿾㔡 ߩ ⊒↢߇᷹ⷰ ߐ ࠇߡ޿ࠆ

ࠄ㧘2005㧘␹↰ࠄ㧘⑳ା㧕ߦࠃࠆᲧᛶ᛫᭴ㅧࠍ૬ߖ㧘㧔Triastuty et al., 2007㧕‫ޕ‬ญ᳗⦟ㇱፉߩᾲ᳓᭴ㅧࠍ Fig.6 ߦ␜ߒߚ‫ߜࠊߥߔޕ‬㧘Ἣญ᧲᷹ⷰὐߩ᷷ᐲߪ㧘2005 ᐕ 5 ᦬ߩ᷹ⷰ㐿ᆎએญ᳗⦟ㇱፉἫጊߩ࿾ਅߢߪ㧘ࡑࠣࡑ߆ࠄଏ⛎ߐࠇߚᓟᓢ‫ߦޘ‬᷷ᐲ਄᣹ߒߡ޿ߚ߇㧘10 ᦬㗃߆ࠄૐਅߦォ

HF㧘HCl㧘SO2 㧘H2S㧘CO2 㧘H2 㧘N2 㧘CO ߥߤࠍ฽ߓߚ‫ߒ߆ߒޕ‬㧘2006 ᐕ 4 ᦬㗃߆ࠄ਄᣹௑ะߦᄌࠊࠅ㧘߻㜞᷷ߩἫጊࠟࠬ߇ᶏ㕙ਅ 600m ઃㄭߢᷓㇱ࿶ജḮ

8 ᦬㨪9 ᦬ߦߪ 99͠߹ߢ਄᣹ߒߚ‫  ޕ‬ߣߥࠆᵹ૕⾂⇐ጀࠍᒻᚑߔࠆ‫ࠄ߆ߎߎޕ‬ಽ㔌਄᣹ߒߎࠇࠄߩྃ᳇ࠟࠬߩ᷷ᐲ਄᣹ߪ㧘ࠣࡑ߆ࠄߩἫጊ

ߚ᳇⋧ߪ㧘࿾⴫ߦྃ಴ߔࠆࠟࠬߦ HCl ߇฽߹ࠇߡߥࠟࠬଏ⛎㊂ߩჇടߥߤߦࠃࠅ㧘ጊ㗂ਅߦሽ࿷ߔࠆᾲ޿ߎߣߣጊ㗂ਅ 300m ઃㄭ߆ࠄጊ㣽ᣇะߩᶏ㕙ਅ᳓♽ౝߦᄌൻ߇޽ߞߚߎߣ෻ᤋߒߡ޿ࠆߣ⠨߃ࠄࠇ

200m ઃㄭߦિ߮ࠆૐᲧᛶ᛫ጀ߇޽ࠆߎߣ߆ࠄ㧘ᶏ㕙ࠆ‫ޕ‬Ἣญධ߅ࠃ߮⷏᷹ⷰὐߣἫญ᧲᷹ⷰὐߢ᷷ᐲ਄ઃㄭߢᶐㅘߒߚᶏ᳓߹ߚߪ࿾ਅ᳓ߣធ⸅ߒ㧘᳓ߦṁ᣹ߩᆎ߹ߞߚᤨᦼ߇⇣ߥߞߡ޿ࠆ߇㧘ߎࠇߪ೨ 2 ⷰ⸃ߒ߿ߔ޿ HF㧘HCl ߩ߶ߣࠎߤߣ SO2 ߩ৻ㇱ߇᳓ߦ᷹ὐߩྃ᳇࿶ജ߇ᒙߊ㧘࿾ਅ߆ࠄߩྃ᳇ࠟࠬ㊂ߩᄌṁ⸃⒖ⴕߒ㧘ᱷࠅߩἫጊࠟࠬߪ਄᣹ߔࠆ‫ߩߎޕ‬਄᣹ൻ߿᳇᷷ߥߤ߇㍈ᢅߦ᷷ᐲߦ෻ᤋߐࠇࠆߩߦኻߒߡ㧘ߥߤߦࠃߞߡࠟࠬㅢ〝๟ㄝߢ㜞๟ᵄߩ࿾㔡߇⊒↢ߔἫญ᧲᷹ⷰὐߦߪⷞ⹺ߢ߈ࠆྃ᳇ࠟࠬߩ᡼಴߇ήߊ㧘ࠆ‫ߚ߹ޕ‬㧘ᣂጪጊ㗂⋥ਅߦ߽ᵹ૕ߩ⬄ߩᓎ⋡ࠍߔࠆ߹ߚ࿾⴫㕙߇⎫㤛ߥߤߢ࿕ൻߒߚ࿾᷷ࠍ᷹ቯߒߡ޿ૐᲧᛶ᛫ጀ߇ሽ࿷ߔࠆߎߣ㧘GPS ᷹ⷰߦࠃࠆጊ૕ߩࠆߚ߼߆㧘߹ߚߪࡑࠣࡑ߆ࠄጊ㗂߳ะ߆߁ࠟࠬᵹ〝⤘ᒛߪጊ㗂⋥ਅߦ㒢ࠄࠇ㧘߹ߚᢿ⛯⊛ߦ⿠ߎࠆߎߣ㧘߇ 2 ♽⛔޽ࠆߎߣߩ෻ᤋߣ߽⠨߃ࠄࠇࠆ‫ޕ‬ߎࠇߣㅪേߒߡྃ᳇᷷ᐲ߽਄᣹ߔࠆߎߣߥߤ߆ࠄ㧘2 ߟߩૐᲧᛶ᛫ጀߦ᜽߹ࠇࠆጊ㗂⋥ਅߦߪࠟࠬḳ߹㧡㧚߹ߣ߼ࠅ߇ᒻᚑߐࠇߡ޿ࠆߣ⠨߃ࠄࠇࠆ‫ޕ‬－ 362 －


SO2,H2S,CO2,H2,CO䉧䉴ḳ䉍㜞๟ᵄ࿾
㔡⊒↢ၞ࿾ਅ᳓䈫ធ⸅
಄ළ䈫HCl䋨SO2)㒰෰Ἣጊ䉧䉴਄᣹

300㷄㸢500㷄

࿶ജḮ
ᵹ૕⾂⇐ጀ
FluxჇട

HF,HCl,SO2,H2S,CO2,H2,CO
Fig.6 A geothermal stricture model of Kuchinoerabujima volcanoෳ⠨ᢥ₂᣿㧕pp.73-76.

੗ญᱜੱ㧔2007㧕㧦2006 ᐕญ᳗⦟ㇱፉἫጊᵴേߩ᭎
ⷐ㧚੩ᄢ㒐ἴ⎇ᐔᚑ 18 ᐕᐲᴺ㓙⎇ⓥ․೎ផㅴ੐ᬺ

ᢪ⮮⧷ੑ࡮੗ญᱜੱ㧔2007㧕㧦ญ᳗⦟ㇱፉἫጊߦ߅ߌ‫ޟ‬ญ᳗⦟ㇱፉߩ᳓⫳᳇῜⊒⊒↢ߣߘߩᓟߩផ⒖੍

ࠆ GPS ㅪ⛯᷹ⷰ⚿ᨐ㧙2004 ᐕ 4 ᦬㨪2006 ᐕ 12᷹ߩߚ߼ߩታ〣⊛⎇ⓥ‫ޠ‬ႎ๔ᦠ㧘pp.6-16.

᦬㧙㧚੩ᄢ㒐ἴ⎇ᐔᚑ 18 ᐕᐲᴺ㓙⎇ⓥ․೎ផㅴ੐ᬺ‫ޟ‬ญ᳗⦟ㇱፉߩ᳓⫳᳇῜⊒⊒↢ߣߘߩᓟߩផ⒖੗ญᱜੱ࡮ጊᧄ࿻๋࡮๧༑ᄢ੺࡮㜞ጊ㏽ᦶ࡮ኹ⍹⋿ᒄ࡮࿦↰଻⟤࡮㝩Ỉ⌀਽࡮౎ᧁේኡ࡮ᐔ㊁⥱৻㇢੍᷹ߩߚ߼ߩታ〣⊛⎇ⓥ‫ޠ‬ႎ๔ᦠ㧘pp.29-32.

㧔2002㧕
㧦ญ᳗⦟ㇱፉἫጊߦ߅ߌࠆ࿾⋚ᄌേ㧚⮋៺ᐔᨋ㗅৻࡮ᣣਅㇱ ታ (1985)㧦ྃἫߩൻቇ⊛೨ళ⃻⽎㧚Ἣጊ㧘30, pp.171-183.

⎫㤛ፉἫጊ࡮ญ᳗⦟ㇱፉἫጊߩ㓸ਛ᷹ⷰႎ๔ᦠ㧘ᐔᨋ㗅৻ (1986)㧦Ἣጊࠟࠬἴኂߣൻቇ⊛ྃἫ੍⍮ߩ

pp.99-108.

⃻⁁㧚Ἣጊ㧘30, pp.S327-S338.

␹↰ ᓘ㧔2007㧕㧦ญ᳗⦟ㇱፉἫጊߩᦨㄭߩ࿾⏛᳇ᄌൻߦߟ޿ߡ㧚੩ᄢ㒐ἴ⎇ᐔᚑ 18 ᐕᐲᴺ㓙⎇ⓥ․೎

Triastuty, H., Iguchi, M., Tameguri, K. and Yamazaki, T.

ផㅴ੐ᬺ‫ޟ‬ญ᳗⦟ㇱፉߩ᳓⫳᳇῜⊒⊒↢ߣߘߩᓟߩ㧔2007㧕: Hypocenters, Spectral Analysis and Source  ផ⒖੍᷹ߩߚ߼ߩታ〣⊛⎇ⓥ‫ޠ‬ႎ๔ᦠ㧘pp.45-48.

MechanismofVolcanic

Earthquakesat␹↰ ᓘ࡮↰ਛ⦟๺࡮ቝᵤᧁల࡮㜞ୖિ৻࡮੗਄ኡ

Kuchinoerabu-Jima: High frequency, Low frequencyਯ࡮ਛဌ ⌀࡮ᣣᶆ ৻࡮᫪ ஜᒾ࡮ศᎹ ᘕ࡮and Monochromatic Events. ੩ᄢ㒐ἴ⎇ᐔᚑ 18 ᐕᐲᓟ⮮⑲૞࡮㐳⼱ਛ೑ᤘ࡮㊀㊁િᤘ࡮ጟ↰㕏┨࡮ጊ㒐ἴ⎇ⓥ․೎ផㅴ੐ᬺ‫ޟ‬ญ᳗⦟ㇱፉߩ᳓⫳᳇῜⊒ญᘕม࡮㈬੗ବテ࡮⮮ᧄᖘᄥ㧔2005㧕㧦⫾ᾲਛߩ⊒↢ߣߘߩᓟߩផ⒖੍᷹ߩߚ߼ߩታ〣⊛⎇ⓥ‫ޠ‬ႎἫጊߩᲧᛶ᛫᭴ㅧ㧘ᐔᚑ16ᐕᐲ․ቯ㗔ၞ⎇ⓥ‫ޟ‬Ἣ๔ᦠ㧘pp.17-24.

ጊ῜⊒ߩ࠳ࠗ࠽ࡒ࠶ࠢࠬ‫ޠ‬ႎ๔ᦠ㧔ઍ⴫㧦੗↰༑

－ 363 －

The Relationship between the Chemical Composition of Volcanic Gas from
Kuchinoerabujima and its Volcanic Activity

Jun-ichi HIRABAYASHI*, Kenji NOGAMI*, Hiromitsu OHSHIMA** and Masato IGUCHI* Volcanic Fluid Research Center, Tokyo Institute of Technology** Gradate School of Science, Hokkaido UniversitySynopsis
The observation of volcanic gas composition and continuous monitoring of the fumaloric
temperature have been done at Kuchinoerabujima volcano since 1980. The activity of southern andwestern parts of the summit crater was increased from 2003. The concentration of sulfur dioxide andhydrogen gas is increased in volcanic gases. The calculated subsurface temperature from the gas
composition is about 500͠. The temperature of volcanic gas is changed with the seismic activity
and ground deformation. From the volcanic gas observation, the activity of Kuchinoerabujima
volcano is clearly increased.
Keywords: Kuchinoerabujima volcano, volcanic gas, volcanic activity－ 364 －